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We installed a 3 TON system in a 1080 sq/ft split ranch.
***Now B4 you jump, I am a lowly install "tech" who is installing someone elses guestimate. My shirt is of a different color***

Now back to my cornfusion. I was with another chap who did the nitro, vac and charge. He leaves and I finish upstaris and go to check out the charge. According to my subcooling calculator it tells me to run away. Seriously, all that is in the little window is a "-" and the side note tells me not to charge as it will cause slugging. The return line 'beer can cold at the king pin. What does my measurements mean? Aside from the oversized unit, bad blagh blagh blagh.

This also peaques curiousity as to how much cooling the house actually needs. So I B.S. the customer and measure the house, walls, windows, doors and orient the house for NSEW. This is what I came up with and let me know if I am close.

Beenthere is right, it is impossible for your liquid line to be below outdoor ambient (cooling mode) unless you have a restriction in the condesner or liquid line prior to your measurement. Find the temperature drop.

Originally posted by docholiday Beenthere is right, it is impossible for your liquid line to be below outdoor ambient (cooling mode) unless you have a restriction in the condesner or liquid line prior to your measurement. Find the temperature drop.

Hopefully the "wacky readings" didnt lead you to a load calc.

The reason that I am doing a load calc is for my own benefit. It wasn't done to begin with. I wanted to see how the 'years of experiance' compared to math. I don't understand about the liquid line being below the outdoor temp.